Stoker construction



CE. ARAN STOKEB CONSTRUCTION Ulf/Y@ INVENTOR WTNESSES:

ATTORNEY structed of fabricated Patented oa. 2o, was.

UNITED STATES PATENT oFFicE..

erro Ansar', or nssING-TON, PENNSYLVANIA, AssrGNon ro wEsTINeI-IousnELECTRIC AND MANUFACTURING ooMrAN'Y, A CORPORATION or PENNSYLVANIA.

STOKER CONSTRUCTION.

' Application filed September 17, 1920. Serial 1ra-410,865. HE'

To all 'whom' t may concernf Be it known that I, O'r'ro ARAM, a citizenof the United States, and a lresident ofy Essington, in the county ofDelaware and State of Pennsylvania, have invented a new anduseful'lmprovement in' Stoker Construction, of which the following is aspecilication. -1

This invention relates to the mechanical stoker's, and more particularlyto stokers of the underfeed type wherein rows of tuyres and fuel-feedingretortsare alter` nately arranged in parallel relation and inclined fromthel front wall of the furnacel to the dump grate. i

An object of the vinvention is to provide a grate surface composed ofparts of simple and durablel construction which may be readily assembledor replaced without materially disturbing other parts of the grate.

Another object is to rovide retorts conrames uponl which detachable sideand bottom plates are 'mounted, thereby obtaining the advantage 'of thesuperior strengthy and ,durability of structural iron frames over theusual cast iron retorts which tend to warp and crack under `the weightand heat of the tuyres and fuel bed usually-supported by the retorts. pBy making the .side and bottom walls detachable and" sectional, they maybe removed in case of. failure' without disturbing thetu yres ornecessitating the removal of.Y they retorts.

.Another object is to provide a retort construction which securely tiesthe rear grate support or dump grate supporting casting to the uppercastingfusually disposed beneath the front wall of the furnace. Thelateral strains imposed upon the dump grate casting and support arequite severe and fref uently cause failure of the cast iron retortframes usually employed which are subjected to uneven temperatures andrapid temperature variations and are taxed to their full capacity insupporting the grates Aor tuyeres. lhe structm'al or fabricated framesare better adapted to withstand the temperature. variations withoutinjury and do not warp out oi shape.

ri`iiese and other objects are attained by' a part hereof, wherein:

.through yastoker structure embodying my Figure ll-is a longitudinalVertical section 4 invention; Fig. 2, a section on the line II- II ofFlg. l showing details of the retort constructlon; F 1g. 3 a sectionsimilar to that of Fig. 2 showing a modified retort construction; Fig. 4is a side elevation showing the rsupportmg members and side wall plates;Fig. 5 is a section on` line V-V of Fior. 4,- `nd Fig. Gis a section online VI- of y eferring to the drawings, the Stoker includes a fuelfeeding hopper which may be of any preferred construction. The dischargechannel 6 of the hopper extends beneath the front Wall k7 of thefurnace, and `fuel is forced through the channel by means of areciprocating plunger 8'which maybe operated in any desired manner. Acasting 9 which extends entirely across the width of the furnace servesto support and connect the fuel ret'orts which are arranged in spacedparallel relation across the width `of thel furnace. The hopper castings5 are bolted or otherwise secured to the front casting 9, and thehoppers and front casting are supported upon an I-beaml 11 which ismounted upon any suitable foundation such as that indicatedat 12.

.Spaced from the front support and extending across the-furnace is arear gratesupport casting'l mounted upon structural frames 14 whichmaybe mounted directly upon the foundations beneath the casting orsupportedl by the side walls of the furnace. The rear casting 13 andthefront casting 9 are connected at spaced intervals by means of framesfabricated from commercial shapes. p

In the construction illustrated in Figure 2, each frame includes anupper tie member 15 and a lower tie member 16 formed of angle iron. riheends of the tie members are bolted securely to the castings 13 and 9 andform a connection, therefor, which. may expand and contract withvariations in temperature without danger of failure. Side plates 17,which are formed in sections and which may be made either of cast orplate iron', are bolted to the upper and lower tie members and form theside walls of the retorts. Sectional bottom plates i8 are placed acrossthe space between the two adjacent IGS frames and rest upon the tiemembers 16 to rectly upon the angle iron 15. It will be seen that theplates 17 may be replacedwithout disturbing the tu res.

The tuyres 19 extend rom a point adjacent the front wall of the furnaceto the lower end of the grate and overlap a dump grate 21 which extendsentirely across thel width of the grate and is pivoted to the castinglat 22. ach retort may 'be-provided with a secondary or auxiliary ram 26which reciprocates in the lower lend of the retort adjacent the lowertuyeres 19 and which agitates the fuel` in the lower portion of thegrate.v- The ram is connected to a driving means, not shown, by means ofa connecting rod 27 which extends forwardly and projects through anupper casting.

While I have shown my invention in but one -form, it will-be obvious tothose skilled inthe art lthat it is not so limited, but is susceptibleof various changes and modifications, without departing from the` spiritthereof, and I desire, therefore, that only such limitations shall beplaced thereupon as are imposed by the prior art or'as are specificallyset forth in the appended claims.

, What I claim is 1. An underfeed stocker having a combustion grateformedv of parallel rows of tuyres extending longitudinally of thelfurnace and retorts between them, front and rear supports for the saidgrate, and a frame comprising structural beam members-connecting thesaid sup orts and supporting the tuyres and walls of) the retorts.

2. An underfeed stoker having a combustion grate formed of alternatelydisposed tuyres and retorts, front and rear supports for Athe saidgrate, and a frame comprising structural beam members connecting thesaid supports' and supporting'y the tuyres and walls of the retorts.

3. An underfeed stoker having a combustion grate formed of alternatelydisposed tuyres and retorts, front and rear supports for the said grate,and a wrought metal 'frame comprising structural beam members connectingthe said supports and supporting thetuyres and walls of the retorts.

L1. An underfeed Stoker construction comprising a plurality ot retortsarranged in spaced parallel relation, each comprising upper and lowerpairs of structural frame members, detachable side plates secured toeach upper frame member and cooperating with the Acorresponding lowerframe meniber and detachable bottom plates connecting vthe lower` framemembers, the said plates forming side and bottom walls respectively ofthe retorts, and grate r tuyres mounted on adjacent upper'frame membersof the retorts and bridging the space between the retorts.

5. In an under-feed stoker having "a combustion grate formed ofalternately disposed tuyres and retorts, front and rear supports for thegrate, a plurality of tie members extending between and connected tosaid supports, lates forming the side'and bottom walls ogsaid retortssecured to said tie members, and tuyres bridging the spaces between andsupported upon-saidretorts.

6. In an' underfeed stokerhaving a combustion grate formed ofalternately disposed tuyres and retorts, front and rear supports for thegrate, .a plurality of tie members extending between and connected tosaid supports, and so disposed relatively to each other as to determinethe cross sectional dimensions and spacing of said retorts, platessecured to said tie members to form side and bottom walls of Vsaidretorts and tuyres Jbridging the spaces between and supported upon saidretorts.

7. In an underfeed stoker having a combustion grate-formed ofalternately disposed tuyres and retorts, front and rear supports for thegrate, an upper series of tie mem- 100 bers and a corresponding lowerseries of tie members extending between and connected to said supports,plates secured to tie members to form side and bottom walls of spacedretorts and tuyres bridging the spaces between and supported upon saidretorts.

8. In an underfeed Stoker having a combustion grate formed ofalternatelydisposed tuyres and'retorts, front and rear supports for thegrate, a plurality of pairs of upper tie members and a plurality ofcorresponding pairs of lower` tie members extending 'between and.connected to .said supports,

plates secured to each up er-and corresponding lower tie .member to'orm=side walls and 115 plates secured to the lower tie members to formbottom walls of the retorts, and tuyres bridging the spaces between andSupported upon said retorts.

9. In an underfeed stoker having a combustion grate 'formed of l spacedrows of tuyres extending longitudinally of the furnace and retortsbetween said rows of tuyres, a unit retort for said Stoker comprising aplurality of pairs of longitudinally 325 extending tie members, anddetachable vplates secured to said tie members to .forni side and bottomwalls of the retorts.

10, In an underfeed Stoker having a coin- A bustion grate formed ofspaced rows of eoV tuyres extending longitudinally of the furnace andretorts between said rows of tuyres, a unit retort `for said Stokercomprising a pair of upper and a pair of lower longitudinally extendintie members, and plates secured ou said tie members to form side andbottom walls of the retort.

"11. An underfeed stoker'construction comprising a plurality of retortsarranged in spaced parallel relation, each comprising'upper and lowerpairs of structural frame members, detachable sectional side plates se-IY cured between each upper and the corresponding lower member anddetachable sectional bottom plates connectin A frame members, the saidplates Forming side and bottomwalls respectively of said retorts andtuyres mounted on adjacent upper frame members of the retorts andbridging the spacebetween them.

In testimony whereof, I have hereunto subscribed my name this 13th dayof September, 1920.

' 'l OTTO ARAM.

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